Galaxies simulated by the FMM
Two galaxies rotating in the opposite direction collide. The total
number of "stars" in the simulation is about 10000 and the shape
of each galaxy has been determined by a pre-simulation until quasi
steady-state was observed. Since the simulation is only 2-D and
since the number of stars is very limited, the result is at best
qualitative but serve here as a demonstration of the speed of the
note that no dark matter
has been included in the simulation.
The fast multipole method employed in the simulations was
detailed in S. Engblom: On well-separated sets and fast
multipole methods, in Appl. Numer. Math.
What happens if they rotate
in the same direction?
Last modified: Mon May 5 13:53:56 MEST 2013